Parse for Postgresql version w/ "beta"

Parse for Postgresql version w/ "beta"

Continuing with the fix that correctly handles Postgresql
version string "10devel" released in 1.1.8, an additional regexp
bump to handle version strings of the form "10beta1".   While
Postgresql now offers better ways to get this information, we
are sticking w/ the regexp at least through 1.1.x for the least
amount of risk to compatibility w/ older or alternate Postgresql
databases.

Change-Id: I12ddb06465f7dcf80563c27632441ef5963f60d4
Fixes: #4005